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Originally Posted by **********
No I think you are mistaken - TheHand is correct. You should read what Google has to say about it and its intended purpose. Also I see nothing anywhere that says that this kind of thing affects page rank.
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Please let me say that both you and Thehand are wrong. Jdoughs is right.
Adding this tag tell google only to consider the page that is written in the content of this tag and eventually to remove from the index the other one. This should be used to avoid duplicate content withing the same site. For example www vs non-www versions of the same page or pages that contains some GET parameters in the URL, the content being the same with or without those parameters.